Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - Manual (Page 129)

4 Operation
4.6.1 Hard Wire Base Block (HWBB) Function
4-46
(3) Resetting the HWBB State
By receiving a servo ON command again after both /HWBB1 and /HWBB2 signals are turned ON, the SER-
VOPACK returns to normal operation status.
To return to normal operation status:
If a servo ON command has been sent while the SERVOPACK is in the HWBB status,
1. Turn on both /HWBB1 and /HWBB2 signals.
2. Send any command other than a servo ON command, such as a servo OFF command, to change the status
of the SERVOPACK from a hard wire base block (HWBB) to a base block (BB).
3. Resend a servo ON command.
Note: Even if the servomotor power is turned OFF by turning OFF the main circuit power, the HWBB status is retained
until a servo OFF command is input.
(4) Error Detection in HWBB Signal
If only the /HWBB1 or /HWBB2 signal is input, an A.Eb1 alarm (Safety Function Signal Input Timing Error)
will occur unless the other signal is input within 10 seconds. This makes it possible to detect failures, such as
disconnection of the HWBB signals.
/HWBB1
/HWBB2
Motor power state Applied Not applied
(Normal operation)
( Requests motor
current shutoff.)
Reference from
option module [Servo ON command]
OFF
ON
SERVOPACK
state
HWBB state BB state Operation

CAUTION
• The A.Eb1 alarm (Safety Function Signal Input Timing Error) is not related to the safety function. Keep this
in mind in the system design.